Diagnosis of leachate from a closed landfill, impact on the soil, and treatment by coagulation flocculation with alginate and ferric chloride

Kastali, Malika; Mouhir, Latifa; Assou, Mohamed; Anouzla, Abdelkader; Abrouki, Younes

doi:10.5004/dwt.2020.26303

Cited by 8 publications

(8 citation statements)

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“…The characteristics of a leachate can generally be represented in terms of basic parameters such as COD, BOD, BOD5/COD ratio, color, pH, content of metallic elements [4]. These results showed that the leachate is characterized by high concentrations of organic matter and high concentrations of ammonium and nitrogen compound (Table 1).…”

Section: Leachate Characteristicsmentioning

confidence: 98%

“…From 5 to 10 years, the landfill is known as "middle age" and its leachate has a COD of between about 3000 to 15000 mg/l [20]. After 10 years, a landfill contains less biodegradable material and the leachate has a COD value of less than 2000 mg/l [4,11]. For a given leachate, fluctuations in pH, flow, COD and BOD5 contents, etc.…”

Section: Leachate Characteristicsmentioning

confidence: 99%

“…For a given leachate, fluctuations in pH, flow, COD and BOD5 contents, etc. have been observed over time [4,11]. This can influence the efficiency of the elimination by different treatment techniques and disturb the receiving environment if the leachate is rejected without treatment, which justifies the installation of a homogenization basin.…”

Section: Leachate Characteristicsmentioning

confidence: 99%

“…Leachate is the juice produced during the fermentation of household waste stored in public landfills, which can pose many problems during the design and maintenance of a landfill. Leachate from landfills has been identified as potential sources of contamination of soil, groundwater and surface water, as it can percolate through soils, causing pollution of waterways and groundwater, s' they are not properly collected, processed and safely disposed of [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The combination of the above factors could generate an effluent whose properties also largely depend on the age of the landfill [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Reducing Pollution of Stabilized Landfill Leachate by Mixing of Coagulants and Flocculants: A Comparative Study

Kastali¹,

Mouhir²,

Madinzi³

et al. 2022

Environmental Management - Pollution, Habitat, Ecology, and Sustainability

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The physico-chemical process of coagulation-flocculation is very efficient and economical for the treatment of leachate. The latter can have considerable impacts on the environment. The leachate from the landfill of the city of Mohammedia is characterized by a high COD content which varies between 2200 and 2700 mg/l, a total Kjeldahl nitrogen concentration varying from 1080 to 1405 mg/l while the ammonium content has a concentration varying between 587 and 1410 mg/l. Organic matter is not readily biodegradable (BOD5/COD: 0.2 to 0.13). Metal concentrations ranged from 0.1 to 4.2 mg/l for Cr, 40 to 5 mg/l for Cd, and 0.3 to 0.8 mg/l for lead. For monitoring the leachate treatment, several coagulants and flocculants were used (FeCl3, Al2(SO4)3, Alginate, cationic flocculants, anionic flocculants). In parallel with the monitoring of the physicochemical parameters we followed the production of the volume of the settled sludge over time. Treatment with all coagulants and flocculants used is pH dependent. Ferric Chloride has been shown to be effective at a pH of 6.5 while for Aluminum Sulfate the optimum pH is 5.3. The results showed that coagulation-flocculation by Ferric Chloride and Aluminum Sulfate is very effective in reducing turbidity. This reduction reaches 95 and 98% respectively for FeCl3 and Al2(SO4)3, while the reduction in COD for the two coagulants is around 60%. Organic flocculants alone do not lead to a significant reduction in turbidity and COD, while their combination with coagulants marks a good reduction in pollution. Hydrated iron hydroxides precipitate more easily than flocs formed by aluminum, resulting in more efficient removal of pollutants than that obtained at lower pH values. The order of introduction strongly influences the coagulation flocculation. The optimal doses of the various coagulants and flocculants chosen for the study vary from one reagent to another. FeCl3 remains the most suitable coagulant to further eliminate organic and metal pollution. The cost associated with the treatment using flocculants remains much higher when the flocculant is used in admixture with a coagulant.

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Section: Leachate Characteristicsmentioning

confidence: 98%

Section: Leachate Characteristicsmentioning

confidence: 99%

Section: Leachate Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The combination of the above factors could generate an effluent whose properties also largely depend on the age of the landfill [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%